how to determine intake closing angle - NCRS Discussion Boards

how to determine intake closing angle

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Chris H.
    Very Frequent User
    • April 30, 1990
    • 817

    how to determine intake closing angle

    I am trying to determine the dynamic compression ratio of an engine. How is the intake closing angle determined? The pages all act as if it is just known for a cam. Is it easily calculated from the advertised intake duration angle?

    Chris
  • Duke W.
    Beyond Control Poster
    • January 1, 1993
    • 15610

    #2
    Re: how to determine intake closing angle

    It depends on how the closing point is defined. SAE J604d defines the valve events at .006" valve lift. Another way to define the valve events is "lash point". The difference for typical cams for each of the four events is 5-10 degrees.

    Most aftermarket cams use the SAE J604d for "advertised duration", but you need to know the centerline to determine the actual open and close points and this is often not specified.

    Vintage OE cams dont's use either of the above two conventions.

    Duke

    Comment

    • Clem Z.
      Expired
      • January 1, 2006
      • 9427

      #3
      Re: how to determine intake closing angle

      check for the timing specs on these OEM cams that are reproduced by crane and F/M by checking their catalogs or websites

      Comment

      Working...

      Debug Information

      Searching...Please wait.
      An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

      Please push the back button and reload the previous window.'
      An unexpected error was returned: 'Your submission could not be processed because the token has expired.

      Please push the back button and reload the previous window.'
      An internal error has occurred and the module cannot be displayed.
      There are no results that meet this criteria.
      Search Result for "|||"